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To begin with, gastric acid is also known as stomach acid. It is described as an acid solution with a pH of 1-2 in the lumen of the stomach. It mainly consists of a small amount of hydrochloric acid and large quantities of sodium chloride and potassium chloride. Stomach Acid Secretion Stomach acid is produced in all the three stages of digestion: cephalic, gastric, and intestinal. The secretion of gastric acid in the cephalic phase is stimulated in anticipation of sensory aspects of food.